<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      let name = "jack";
      console.log(name); // jack

      // Identifier 'name' has already been declared
      // let name = "lili"; //重复声明变量

      console.log(name);
    </script>
  </body>
</html>
